MIL-PRF-85725A(AS)
c. Maximum pressure drop across tier: 2 inches of water for Format B and designs; 2.75
inches of water for Format E designs.
d. Maximum module guide rib temperature: 85°C (185 °F).
e. Maximum outlet air temperature: 71°C (160 °F).
f. The minimum design goal for the air flow rate shall be 3 lb/min-kW of cooling air.
3.4.4 Electromagnetic interference.
3.4.4.1 Shielding effectiveness. The rack shall be designed to act as an effective shield
against incident electric, magnetic, and electromagnetic field radiation.
3.4.4.1.1 Outside-to-inside. The outside-to-inside shielding effectiveness of the rack shall
meet the minimal requirements shown on figure 6 when tested in accordance with 4.5.5.1.1.
3.4.4.1.2 Tier-to-tier. The shielding effectiveness between tiers shall meet the minimal
requirements shown on figure 7 when tested in accordance with 4.5.5.1.2.
3.5 Dimensions. The cooling rack shall be capable of accommodating between 2 and 7 tiers
and interfacing with the backplane shown in figure 1 (see 4.5.1).
3.6 Weight. The maximum system mass shall be 14.3 pounds/tier for Format B modules,
25.4 pounds/tier for Format C modules, and 82.7 pounds/tier for Format E modules. The tier
mass includes all the mechanical structure of the tier and dummy modules (see 4.5.1.1).
3.7 Marking. Each rack and component shall be marked in accordance with MIL-STD-130
in a manner to ensure that the information remains intact and legible throughout the life of the
item, and shall be located so that the marking is not obscured (see 6.2).
3.8 Workmanship. Painted surfaces shall be uniformly coated. Metal parts shall be free of
burrs or sharp edges (see 4.5.1).
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified
as follows:
a. First article inspection (see 4.2).
b. Conformance inspection (see 4.3).
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